Watch casing



FIG. 1 is a front view of a watch casing showing my new design,

FIG. 2 is a left side view thereof;

FIG. 3 is a right side view thereof,

FIG. 4 is a bottom view thereof,

FIG. 5 is a top plan view thereof,

FIG. 6 is a bottom plan view thereof. 

The ornamental design for a watch casing, as shown and described. 